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A368017 as a simple table

na(n)
01
1-2
2-4
314
4144
5286
6-5080
7-61058
8-186144
94016958
1073395928
11468915102
12-4728823088
13-167453193314
14-2051810224568
15-406640603074
16533831885402048
1711987797433266302
18110763307665075640
19-1459040819952150178
20-80503810962755821904

[1,-2,-4,14,144,286,-5080,-61058,-186144,4016958,
 73395928,468915102,-4728823088,-167453193314,
 -2051810224568,-406640603074,533831885402048,
 11987797433266302,110763307665075640,
 -1459040819952150178,-80503810962755821904]